This commit fixes several kernel object leaks. The most severe of them
was threads not being removed from the private handle table used for
CoreTiming events. This resulted in Threads never being released, which
in turn held references to Process, causing CodeSets to never be freed
when loading other applications.

Moved most of the shared CFG code there, implemented a few CFG:I functions

in the service's headers

This was automated using `clang-modernize`.

Most functions already operate on std::strings. This also removes the need to manually null terminate thread names.

- various cleanups

- various cleanups/refactors to HLE services